import turtle
import math

#定义多个点的坐标
x1,y1 = 100,100
x2,y2 = 100,-100
x3,y3 = -100,-100
x4,y4 = -100,100


#绘制折线
turtle.penup()
turtle.goto(x1,y1)
turtle.pendown()

turtle.goto(x2,y2)
turtle.goto(x3,y3)
turtle.goto(x4,y4)


#计算起始点和终点的距离

distance = math.sqrt((x1-x4)**2 + (y1-y4)**2)

turtle.write(distance)


